I've flown SDTB aircraft and I thought they were fastidious with their maintenance. In fact proper engine handling was emphasised and critiqued just as much if not more than the actual jump. They had aircraft on blocks waiting to get re-weighed and certified after making changes, and more LAMEs than I've ever seen in a single hangar.
The C208 they use near me was brand new when they bought it. Doesn't get a whole lot better.